1) Thracian tribe 
The Bebryces were a tribe of people who lived in Bithynia. According to Strabo they were one of the many Thracian tribes that had crossed from Europe into Asia. According to legend they were defeated by Heracles or the Dioscuri, who killed their king, Mygdon or Amycus. Their land was then given to King Lycus of the Mariandynians, who built the cit...
the original inhabitants of Bithynia who lost their land to the Mariandyni.